displayio: swap colors in palettes too

.. change the in-rom palette to be in RGB565 order

Author: jepler

shared-module/displayio/Palette.c

@@ -83,7 +83,12 @@ bool displayio_palette_get_color(displayio_palette_t *self, const _displayio_col
     } else if (colorspace->grayscale) {
         *color = self->colors[palette_index].luma >> (8 - colorspace->depth);
     } else {
-        *color = self->colors[palette_index].rgb565;
+        uint16_t packed = self->colors[palette_index].rgb565;
+        if (colorspace->reverse_bytes_in_word) {
+            // swap bytes
+            packed = __builtin_bswap16(packed);
+        }
+        *color = packed;
     }
 
     return true;

supervisor/shared/display.c

@@ -169,28 +169,28 @@ _displayio_color_t blinka_colors[7] = {
     },
     {
         .rgb888 = 0x8428bc,
-        .rgb565 = 0x7889,
+        .rgb565 = 0x8978,
         .luma = 0xff, // We cheat the luma here. It is actually 0x60
         .hue = 184,
         .chroma = 148
     },
     {
         .rgb888 = 0xff89bc,
-        .rgb565 = 0xB8FC,
+        .rgb565 = 0xFCB8,
         .luma = 0xb5,
         .hue = 222,
         .chroma = 118
     },
     {
         .rgb888 = 0x7beffe,
-        .rgb565 = 0x9F86,
+        .rgb565 = 0x869F,
         .luma = 0xe0,
         .hue = 124,
         .chroma = 131
     },
     {
         .rgb888 = 0x51395f,
-        .rgb565 = 0x0D5A,
+        .rgb565 = 0x5A0D,
         .luma = 0x47,
         .hue = 185,
         .chroma = 38
@@ -203,7 +203,7 @@ _displayio_color_t blinka_colors[7] = {
     },
     {
         .rgb888 = 0x0736a0,
-        .rgb565 = 0xf501,
+        .rgb565 = 0x01f5,
         .luma = 0x44,
         .hue = 147,
         .chroma = 153